Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cd34ed94c6b5ff…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8b0155b51ef1cc23d4c0c95390aac59a SHA-1: 7c38fc104ee594369036069aa661de9cd6b83896 SHA-256: 61cd34ed94c6b5ffac75ffb826c53f1ee85b3c7cce62fcc8b2148d34618095c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, with one URL specifically identified as a compromised CMS upload. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond directing users to external links. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or traffic-driving campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97ceabba0---rebezigakuto.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/gixevesutaritimi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/24204311266.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/34465888930.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/23826825387.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0c68f58de8b81cd307c307cc83d083bc/nakimetozaxagexamagezu.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/zufemifakotijejo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xajirelesopuranelun.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tamoxukifezidesefan.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d55460a4---1424012547.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1c50193b---dolefefaselipoma.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed91d909---85737178944.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/cb7ce569b48f994255e064d6b6273544/95377665144.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8e726c52---bovitexopitimo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/65dvbu48j01lrgi7vnso3bmupv/56367170254.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/63294824049.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/luzev.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8f1224171e81dcd82dc01c898971ac4f/75188478148.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d08e80b483c0a06e61ad7b6b4e57bdf/zukikibatotagijugobemo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/6143808606.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160707fc714944---ferakixokavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+hack+ragdoll+engine+on+mobilePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 10956 bytes
SHA-256: 5be36682418db203bb58aeed8b80db4060b1c7cf5808cb54ea3ad8bfe55f2404
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 17472 bytes
SHA-256: d16a61d2190d041ad02a8fdb0d478c854fb68820a56a3c906896dec1d5b8b25e

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